Motor-controller.



P. H. ZIMMER.

- MOTOR CONTROLLER. APPLICATION FILED MAR. 1, 191a. RENEWED DBO. a, 1913.

1,102,315 Patented July 7, 1914.

UNITED STATES PATENT onnrcn.

PAUL H.;ZIMM;ER, QEMILWAUKEE, WISCONSIN, ASSIGNOB TO THE CUTLER-HAMMER MFG. 00., OF MILWAUKEE, "WISCONSIN, A. CORPOBATION..OF WISCONSIN.

Specification of Letters Patent.

-,Patented July '7, 1914.

Application filed March 1,;19-1,3,:,Serial;No.-;751,493. Renewed December 3, 1913. Serial No. 804,484.

My invention relates to motor controllers.-

It has amongits objects-to provide .asimple and easily manipulated =compound starter which .will=insure full :field strength of :the motor in starting; which .will ,neces. sitate. due-regulation of the motor armature :prior to -regulationtof the field, and-which will stop the motor \WlthOflt varying its fieldstrength.

Other objects andadvantagesof -my in- .vention will hereinafter appear.

:For thepurposeofifully and clearly disclosing the [nature and advantages .of my invention I-Sh3ll describeithe controller diagrammatically illustrated in thezaccompanying drawing, .which embodies .my invention in a preferred form. it shonl'd be :understood, ihowever that the form of-the controller selected .for the purpose ofillustration is not tozbei considered as unnecessarily limiting the scope-ofthe appended claims.

The controller illustrated comprises two I arms 1 and 2, the former being .movab1e over a seriesof contacts 3-to1vary a resist-.

ance ER and the latter ibeing movable over aseries of contacts 4-.to varya resistance R.

The resistance R is shown as 'connected in circuit withathe; armature A of a shunt motor M while the-resistance QR is-shown connected in circuit with-the shuntfield F of saidmotor.

-The arms '1 and 2 are movable together to the right-toremove-the resistance R from the armature circuit of the motor, whereupon the-arm 1 is held-by a retaining magnet '5 against theactionof a-return spring .6 "The arm-2 is-then movable to' the left independently. i of the a-rm -1 to insert the resistance R" in the field circuit of -the motor. "As is well 'understood'iin the-art, the removal of-the resistancekR fromy-the-armature circuit of the =motor' accelerates the motor to" a predetermined degree, While the subsequent insertion of the field 1 resistance further accelerates the motor.

its conta In controllers of the compound type it is desirable, if not imperative, to start the motor under full field strength, to remove thearmat-ure resistance prior to the insertionof any field resistance and to guard against variation of the field strength in stopping the motor.

I shall now describe in detail the very simple construction illustrated which secures the aforesaid results and which further enables the complete operation of the controller by a single handle, and further, the removal of the field resistance and subseqnentremoval of the armature resistance by operation of said handle in a single derection. The arms 1 and 2 are preferably pivoted concentrically as illustrated, and thefilatteris employed as the operating arm. To this end the arm 1 is provided with an upwardly extending lug 7 to be engaged by .the arm 2in'its movement to the right and said arm 2-isprovided wit-h a suitable operating handle 8. With this arrangement the arm 2 maybe moved-to the right to move the arm 1 into-position to be held by the retaining magnet 5, whereupon said arm is left free tobe moved to the left independently ofith-e arm :1. The arm 1 is returnable to initial positioniby the spring 6, which in practice is preferably a hub spring. The arm'2 has a widerrange of movement than ithe arm :1, which is limited by the magnet 5 and a itop -Qand said arm 2 moves over c s 4 only when outside of-the range of movem'entof the arm 1. When moved with the arm 1 the arm 2 en ages a contact segment -10, through themedium of which it maintains the continuity of the field cir cuit during the removal of the armature resistance. As before set fort'h, the arm 1 :is movableito the right to remove the resistance R while the arm 2 is movable in the same direction to remove the resistance R and movableto the left to insert said resistance.

sition to include a portionof'the resistance =R'gin' the'field circuit of thelmotor.

The operation of the controller and the circuit connections established thereby will now be describedi To start the motor the handle 8 is moved to the right, thereby 40 moval prior to the insertion of any of the field refirst moving the arm 2 over its contacts to remove the field resistance R from circuit. When the arm 2 reaches the segment 10 all of the field resistance R will be removed 5 from circuit and said arm will engage the lug 7 on the arm 1. Continued movement of the arm 2will then move the arm 1 into engagement with its contact 3. This completes the motor circuit. The field circuit of the motor may be traced from line L by conductor 11 to the hubs of both arms 1 and 2, thence through arm 2 to segment 10, by conductor 12 through the shunt field winding F to the line L. The armature circuit may be traced from conductor ll-through arm-1 to the first of its contacts 3, thence through all of the resistance R, by'conductor 13 through the motor armature A to line L. The motor isthus started with full field strength. and with all of the resistance R in circuit with its armature. "Continued movement of the two arms to the right will gradually remove the resistance R without affecting the field circuit. When all of the resistance R is removed from circuit the arm 1 is grasped by the retaining magnet 5. The retaining magnet is shown as connected directly across the lines by conductors 14 and 15 through a resistance 16. The arm" 2 is then free to be moved to the left and, upon passing off of segment 10 and ,onto its contacts 4, will gradually insert the resistance R in circuit with the shunt field winding F. The arm 2 is unbiased, and accordingly may be left in any desired osition in accordance with the degree of fie d regulation desired. -It will "thus be seen that the controller insures the removal of all field resistance prior to startin the motor and also insures the reall of the armature resistance sistance. To stop the motor the arm 1 is released from the magnet 5, whereupon it is returned to initial position by its spring 6,

thereby gradually reinserting the resistance R in the armature circuit and then interrupting the armature circuit; If, during operation of the motor the arm 2 is moved to insert resistance in the field circuit, it will be out of the range of the arm 1 and accordingly. will be unafiected by the return of the arm 1 to initialposition to stop the motor. Consequently-the field strength of the motor will in no wise be varied by the controller upon operation thereof to stop the motor.

Any field resistance previously inserted in circuit willremain in circuit until. the arm 2 is manually operated to remove'the same.

What I claim as new and desire to secure by Letters Patent is: Y

controlling member, the latter in its operaitive positlonsbeing out of the range of movementmf the former and being movable and in an op osite direction from its lmtia position for eld control.

3. In a motor controller, in combination,

-a field resistance, an armature resistance,

and two controlling elements movable in the same direction one by the other to remove said resistances successively, said field resistance controlling element being then movable in a reverse direction to regulate said field resistance and when so operated bein 5 independent of'the return movement of sai armature controlling element.

4. In a motor controller, in combination, an armature controlling member biased to initial positiommeans for retainin the same in running position, a field control ing member movable in a single direction to increase the field strength of the motor and then engage and move said armature controlling member from initial position to running positi'on, said field controlling member bemg thereafter movable to a position to weaken the motor field and to be independent of the return movement of said armature controlling-member. v

5. In a motor controller, in combination, a series of field resistance contacts, a series ;of armature resistance contacts, said series of contacts extending inopposite directions, a controlling member movable over said 106 armature resistance contacts, a member movable over said field resistance contacts and also movable to engage and operate said armature resistance controlling member, said members removing their respective re- 110 sistances upon movement in the same direction.

6. In a motor controller, in combination, an armature resistance,-a field resistance, two op ositely extending series of contacts connec ed to said resistances, two members movable in the same direction over said contacts to remove said resistances, and and means operatively connecting said members when in their respective initial positions for enabling operation of, said armature resistance controlling member by said field resistance controlling member, said field resistance controlling member when in engagement with its respective contactsibeing unafiected by the return movement of said armature resistance controlling member to its initial position.

tacts independently of the other member and being unafiected by the return move- 10 ment thereof.

In witness whereof, I have hereunto subscribed my name in the presence of two witnesses;

PAUL H. ZIMMER.

Witnesses: I

FRANK H. HUBBARD, LEONARD A. WATSON. 

